#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <assert.h>
void my_strcat(char* s1,const char* s2)
{
	while (*s1 != '\0')
	{
		s1++;
	}
	while (*s2 != '\0')
	{
		*s1 = *s2;
		s1++;
		s2++;
	}
}

int main()
{
	char arr1[12] = "hello";
	char arr2[] = "world";
	my_strcat(arr1,arr2);
	return 0;
}
